A fief.
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The knights were originally the heavy cavalry. The word knight came to be a title, usually given by a monarch, and was regarded as the lowest level of the nobility. A vassal was a person who had a relationship of mutual obligation with a lord. The vassal sword loyalty and obedience, and the lord granted land and protection in exchange. A vassal could be a knight, and a knight could be a vassal, but there was nothing saying they had to be.
A person who swore to be loyal and support a lord was that lord's vassal. The lord gave land and protection in exchange, so it was a mutual pledge and obligation.
Lords owned land, which they did not grant to their vassals, but they did grant the right to live and work on that land as tenants.
A vassal was a person in a state of mutual obligation with a king, which usually gave the vassal an estate, including manors. A serf was a person in a state of mutual obligation with the lord of a manor. As such the serf was possibly a person who worked on the estate of a vassal. Please see the links below.
A lord provided a vassal with a fief-a piece of land, and in exchange the vassal plowed the land and took care of it, getting a portion of the agriculture for his and his own family´s support, and a place to live. So basically land to live in and own support in exchange for serving the Lord